Fluid warmer



Aug. 23, 1932. w. CARPENTER FLUID WARMER Filed July 25, 1950 INVENToR. Wsfer* I. Chr/Geni?? BY M j 4 ATTORNEY.

Patented Aug. 23, 1932 kwaas.'mim :,CARPENaEn oF NORFOLK, VIRGINIA v FLUID WARMER v nppuoauonlnied July 25, 193,0. serial No. 4.703,48;Y

j This invention relates to :a fluid warmer lprimarily adapted for use in connection with a dental syringe, vand has vfor its primary object to' provide, in a manner as'hereinafter set forth, a device of such character by means of which wateror air ofthe/exact temperature required may be discharged into 4the syringe in order that` a cavity in asensitive tooth may be irrigated or dried with the proper uid at body temperature.

A further ob'ect of the invention is to provide a Huid warmer of the character aforesaid by means of which a supply of fluid may be heated and stored at a required temperature until the same is drawn off for use, therelby insuring a constant and adequate supply 'of the'luid at the required temperature, irrespective of the rate at which it isdesired to ldraw the fluid from the warmer; f

A'further object of the invention is to pro- Ivide a fluid warmer vof thecharacter aforesaid which includes'y a replaceable heating '-unit which maybe readily assembled or disassembledl with respect tothe lwarmer while the latter is inuse morder that the warmer may continue to discharge Huid at the temperature required in the' eventy thaty the heatlng unit should become damaged.

With the foregoing and other objects in view, thefinvention consistsof the novel construction, combination and arrangement of parts as hereinafter more particularly described, and as illustrated in the accompanying drawing wherein is shown an embodiment 'of the invention, but it is to be understood that the description and drawing are to be taken as illustrative and that the invention 'lis intended to be limited only by the scope ofthe claims hereunto appended.

In the accompanying drawing in which like numerals are employed to designate like parts throughout the several views:-

, Figure 1 is a vertical section through a fluid warmer in accordance with this invention showingr the same association with ailuid conduit.

Figure 2 is a perspective view of the heating unit forming a part of the warmer.

Figure 3 is a horizontal section through the warmer.

Referring to the drawing in detail, the numeral 1 indicates ra casing which is preferably of cylindrical construction having a flanged bottom 2 threaded on the lower end thereof and further having a flanged rtop 3 threaded on the upperend thereoi; lThe bottom 2, isy formed centrally thereof withy a threaded opening which is engaged by external threads on the reduced neck 4 of'a cup 5 disposed within the casing 1. The neck 4 .is of hollow construction'and is provided with threads for engagement by the threaded upper end'of a hollow outlet plug 6, the lower end of which may be connected in any suitable manner with a fluid conduit, such as 7.

The. cup 5'isl internally threaded for engagement with external threads on the lower end of a cylindrical jacket 8 which extends longitudinally of the casing land has its open upper-end arranged in spaced relation kto the top. Extending into the `jacket 8 is a heating element indicated generallyl at 9 which includes a resistance coil 10 imbedded within a di-electric heat' conducting body 11 which is hermetically sealed within a tubular container 12. Secured within the lower end of ythe container 12 and projecting ytherebelow into spaced relation to the outlet plug G is a heat conducting block 13.

Threaded into the upper end of the container 12-is a tube 14, rthe upper end of which f is threaded into a hollow cap 15 having a skirt portion 16 encircling a portion' of the tube `14 in concentric, spaced relation thereto. The cap 15 is threaded into an opening vformed centrally of the top 3 of the casing and is formed with a! flange 17 resting on the upper face ofthe top 3. The upper end of the tube 14 isr closed by means of a plug 1S which is threaded into the cap 15 above the tube 14, and is provided with an opening 19 of proper size to permitfthe snug passage therethrough of a pair of conductors 20 which extend through the tube 14 and which areconnected respectively to the respective ends of the .coil 10. The conductors 2O `are adapted for connection with a suitable source of electrical energy, not shown. L f 1 Thev casing 1 is 'provided ln vspaced `relation tothe bottom thereof with a hollow inlet plug 2l for connection with a fluid supply conduit 22 which is adapted for connection with a suitable source of fluid supply, not shown. Preferably a suitable thermostat, not shown, will be provided within the casing l for the purpose of controlling the supply of electrical energy to the resistance coil 10. The inlet plug 2l is in alignment with the resistance coil l0 radially of the casing.

In the operation of the warmer, a fluid is injected thereinto through the inlet plug 21 directly opposite the source of heat within the jacket 8. The lluid thus injected into the casing is slightly warmed by conduction through the wall of the jacket and rises within the easing and flows over the top of the jacket S into the interior of the latter to surround the heating element 9 disposed within the acket. The fluid is heated to a higher degree immediately opposite the coil l() than in the lower portion of the jacket 8, whereby the warmer fluid rises within the jacket, and the less warm fluid may be drawn off for use through the outlet plug 6. The

duid below the level of the coil l() also is warmed by conduction through the plug 13. The warmer fluid rising within the jacket 8 replaces the cooler fluid within the upper portion of the jacket. lVhen all the fluid within the jacket 8 becomes warm, the fluid overflows the upper end of the jacket and mises with the cooler fluid in the upper end of the casing l whereby the fluid in the upper end in the casing is brought to the same temperature as that within the jacket.

In the event that the heating element 9 becomes damaged, the same may be readily removed simply by unscrewing the cap 15 from the top 3 of the casing. The damaged heating element may then be removed froln the cap after which the cap may be secured to a new heating element and returned to its position with respect to the top 3. It will be readily seen that the replacing of the heating unit is but the work of a moment and may be readily accomplished without interrupting the discharge of warm fluid through the outlet plug 6.

It is thought that the many advantages of a fluid warmer in accordance with this invention will be readily apparent, and although t-he preferred embodiment of the invention is as illustrated and described, it is to be understood that changes in the size, shape and arrangement of parts may be resorted to, so long as such changes fall within the scope of the invention as defined in the appended claims.

lVhat I claim is z- 1. A fluid warmer comprising, a casing having an outlet plug at the bottom thereof and an inlet plug in spaced relation to the bottom thereof, a. jacket secured to the bottom of the casing and extending longitudinally thereof in concentric relation thereto and to the outlet plug, said jacket having an open upper end in spaced relation to the top of the casing, a heating element extending into the jacket, and means for detachably securing the heating element to the top of the casing, said heating element including a resistance coil of materially less length than the jacket and in alignment with said inlet plug transversely of the casing to initially warm the fluid entering the casing, said resistance coil disposed in the lower portion of the jacket but spaced from the lower end thereof to maintain the hotter fluid out of contact with the outlet plug, said heating element further including a container within which the resistance coil is hermetically sealed, said container having a heat conducting block descending therefrom into proximity to the outlet plug to warm the fluid adjacent the latter.

2. A fluid warmer comprising, a casing having an outlet at the bottom thereof and an inlet in spaced relation to the bottom thereof, a jacket extending longitudinally of the casing in concentric relation thereto and to the outlet, means closing the bottom 0f the jacket to the easing, said jacket having its top open to the casing, a heating element extending into the jacket and including a resistance coil of materially less length than the jacket and in alignment with said inlet transversely of the casing to initially Warm the fluid entering the casing, said resistance coil disposed in the lower portion of the jacket but spaced from the lower end thereof to maintain the hotter fluid out of conhereto.

WEBSTER I. CARPENTER. 

